Unusual diffusivity and clustering of alkali metals on the Si(111)-7x7 surface

Wu, Kehui

doi:10.1016/j.stam.2005.06.023

Cited by 10 publications

(1 citation statement)

References 17 publications

(49 reference statements)

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“…The behaviour of adsorbed atoms depends on the temperature of the semiconductor surface [49,50,70]. At room temperature, the atoms will diffuse across the surface at a rate Figure 6.…”

Section: Effect Of Adsorbed Atoms On the Electron Gasmentioning

confidence: 99%

Zone-plate focusing of Bose–Einstein condensates for atom optics and erasable high-speed lithography of quantum electronic components

et al. 2010

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We show that Fresnel zone plates, fabricated in a solid surface, can sharply focus atomic Bose-Einstein condensates that quantum reflect from the surface or pass through the etched holes. The focusing process compresses the condensate by orders of magnitude despite inter-atomic repulsion. Crucially, the focusing dynamics are insensitive to quantum fluctuations of the atom cloud and largely preserve the condensates' coherence, suggesting applications in passive atom-optical elements, for example zone plate lenses that focus atomic matter waves and light at the same point to strengthen their interaction. We explore transmission zone-plate focusing of alkali atoms as a route to erasable and scalable lithography of quantum electronic components in two-dimensional electron gases embedded in semiconductor nanostructures. To do this, we calculate the density profile of a two-dimensional electron gas immediately below a patch of alkali atoms deposited on the surface of the nanostructure by zone-plate focusing. Our results reveal that surface-induced polarization of only a few thousand adsorbed atoms can locally deplete the electron gas. We show that, as a result, the focused deposition of alkali atoms by existing zone plates can create quantum electronic components on the 50 nm scale, comparable to that attainable by ion beam implantation but with minimal damage to either the nanostructure or electron gas.

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“…The behaviour of adsorbed atoms depends on the temperature of the semiconductor surface [49,50,70]. At room temperature, the atoms will diffuse across the surface at a rate Figure 6.…”

Section: Effect Of Adsorbed Atoms On the Electron Gasmentioning

confidence: 99%

Zone-plate focusing of Bose–Einstein condensates for atom optics and erasable high-speed lithography of quantum electronic components

et al. 2010

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Electron correlation and many‐body effects at interfaces on semiconducting substrates

Tejeda

Fagot‐Revurat

Cortés

et al. 2012

Physica Status Solidi (a)

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Low dimensional systems are characterized by at least one spatial dimension of only some atoms. Such size reduction has often important consequences for physical properties. Electronic correlation and electron–phonon coupling can originate Mott insulators or charge density waves (CDWs), both phenomena enhanced by dimensionality reduction. Interfaces offer a natural way of reducing the dimensionality. Among all the surfaces, semiconducting surfaces are particularly well adapted for electronic correlation studies. In them, correlation is enhanced because of the low dimension, the electronic localization in dangling bonds and the large inter‐orbital distances in reconstructions. Despite these factors favoring correlation, eventually stronger than in bulk systems, the field is by far much less developed. We review here the discovery of correlated surfaces, while studying the Schottky barrier of alkalis on Si or GaAs, and coetaneous studies on SiC. We summarize then the studies on K/Si(111):B, whose ${\left( {\sqrt {3} \times \sqrt {3} } \right)}R30^\circ $ was considered a surface Mott insulator with an important electron‐phonon coupling. The recent discovery of a ${\left( {2\sqrt {3} \times 2\sqrt {3} } \right)}R30^\circ $ symmetry has been first interpreted as evidence of a bipolaronic insulator, but new findings have finally proven it to be a band insulator. We will then focus on the model system Sn/Ge(111). The last unclear issue about the (3 × 3) reconstruction at 150 K was related to the Sn 4d core level. High‐resolution photoemission has clarified the core level deconvolution while refining the structural model. This metallic reconstruction is sensitive to electronic correlations which trigger a phase transition to a Mott phase below 30 K.

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Scanning MWCNT‐Nanopipette and Probe Microscopy: Li Patterning and Transport Studies

Larson

Bharath

Cullen

et al. 2015

Small

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A carbon-nanotube-enabling scanning probe technique/nanotechnology for manipulating and measuring lithium at the nano/mesoscale is introduced. Scanning Li-nanopipette and probe microscopy (SLi-NPM) is based on a conductive atomic force microscope (AFM) cantilever with an open-ended multi-walled carbon nanotube (MWCNT) affixed to its apex. SLi-NPM operation is demonstrated with a model system consisting of a Li thin film on a Si(111) substrate. By control of bias, separation distance, and contact time, attograms of Li can be controllably pipetted to or from the MWCNT tip. Patterned surface Li features are then directly probed via noncontact AFM measurements with the MWCNT tip. The subsequent decay of Li features is simulated with a mesoscale continuum model, developed here. The Li surface diffusion coefficient for a four (two) Li layer thick film is measured as D=8(±1.2)×10(-15) cm(2) s(-1) (D=1.75(±0.15)×10(-15) cm(2) s(-1)). Dual-Li pipetting/measuring with SLi-NPM enables a broad range of time-dependent Li and nanoelectrode characterization studies of fundamental importance to energy-storage research.

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Unusual diffusivity and clustering of alkali metals on the Si(111)-7x7 surface

Cited by 10 publications

References 17 publications

Zone-plate focusing of Bose–Einstein condensates for atom optics and erasable high-speed lithography of quantum electronic components

Zone-plate focusing of Bose–Einstein condensates for atom optics and erasable high-speed lithography of quantum electronic components

Electron correlation and many‐body effects at interfaces on semiconducting substrates

Scanning MWCNT‐Nanopipette and Probe Microscopy: Li Patterning and Transport Studies

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